Typewriting machine



G. A. SEIB TYPEWRITQING MACHINE March 24, 1925.

Filed May 9, 1923 Patented Mar. 24, 1925.

UNITE-D S ES;

PATENT OFFICE- GEORGE-A; sens, orrrron, NEW YORK, ASSIGNOR'TO REMINGTONTYPEWRITER canrm, ,0]? ILIoN, NEW "roan, {A ooaronerron or nnw YORK.

.ryrnwmrme MACHINE.

fir p'ncat'ion aiea'na-y '9, 1928. serrai'm. 637,623.

To all whom z't mocg concern? Be it known that I, GEORGE A. Sine, citizen of the United, States, and resident of Ilion, in thef'county of Herkimer and State oflYew York, haveinvented certain new and useful lmpr'ovements in Typewriting Machines, of which "the following is a specification. v

My inventionrelates to typewrit-ing machines, and morerp'articularlyto case shift mechanism therefor. d

The object of th f'invention, generally statech is to provide "an improved, simple and efficient case shift mechanism by which a like extent of shift may be effected by keys at opposite sides of the 1nachine, and the train of shifting connections are prevented from being unduly'strained, deranged or distorted'by pressure exerted on the shift keys. .To the above and other ends which will hereinafter appear my invention consists in the features of construction, arrangements of parts and combinations of devices set forth in the following description and par- 23 ticularly pointed out in I the appended .In the accompanying drawings, wherein like reference character indicate correspondns pa t in th ld fi e i ws l i Figure isa fragmentary detail .side elevation with parts section showing. a part of the case shiftinginech anism and some of the associated features of "the construction.

Figure 2 is a'detail perspective view of a portion of the same g I t Figure 3 is a detail vertical sectional view taken through the pivot which unites two of the casev shifting lever arms; the section being taken on the line3 -i3 of Fig.1 and looking in the direction of the arrows at said line. I I

I have shown my invention in the present instanceembodied in a standard Remington machine, such as the ,No. --10; only so much of said machine being shown as is necessary to illustrate my invention in its embodiment therein. Itshould be understood,

however, that the devices of the invention are not restricted to use in such machines. a

v In the standard Remington machine, as the No. 10, for example, the carriage truck, designated as a whole by the reference numen-a1 4,ca'rries a platen frame 5 connected to the truck by the usual, links fiend 7. These link a p v ed a their oi erd ends, as at 8,Jt0 the truck 4, and at their rear ends, as at 9, to the platen frame Said frame carries a cylindrical platen 10 having a platen shaft or spindle 11 that extends through nipples 12 on the platen frame. Each of these nipples is surrounded by a coiled spring 13 which constitutes a stop surface. Each nipple with its spring projects through an upright slot 14 in the truck.- Upper and lower screw stops 15 and 15 respectively, carried by the truck, coact,

with the sides of the springs 13 to limit the case'shifting movements of the pla-tenframe and the platen carried thereby. The platen frame carries a grooved roller 16' which bears on a shift rail 17.

This shift rail is fixedly connected near its ends with depending links 18pivoted at their lower ends,

as at 19, to the rear ends of lever arms 20,

one located near each side of the machine. These lever arms are riveted at 21. to reduced 'slab'bed ofi endsof a rock shaft 22.

This shaft may, if desired, have circumferential grooves 23 cut therein-to receive and support'tabulator levers, as pointed out in my companion application Sr. No. 546,316,

filed -March 24, 1922 (now Patent No.-

1,479,326, dated Jan. 1, 1924). The rock shaft 22 is apertured at its ends, indicated at 24, to receive the pointed ends of coned pivot screws 25. These screws are received in tapped openings in the base 26' of the machine, and are held in place by lock nuts 25. It will be understood that the lever arms or side members 20'and the rock shaft 22 constitute a frame, the parts of which are fixedlv connected at or adjacent to the axis of the rock shaft and at or adjacent to the pivotal center of the frame. This point of connection is most effective to cause both lever arms 20 to move together and thus "cause an equalIlifting of the shift a rail 17 at both ends thereof. J r

A shouldered pivot screw 27 constitutes a pivotal connection between each lever arm 20 and a second or key-carrying lever arm; a nut 27) holding the ,lever arms united. The second lever arm at the right-hand side of the machine is designated by the reference numeral 28, andit carries a shift-key 29 at the forward end thereof, whereas the left hand key-carrying lever arm is designated bythe reference numeral '30, and it carries ty, 1 a ais -10am 2. Ea h ke -"carrying lever has a depending stop projection 33 adapted to coact with an adjustable screw stop 34 carried by a fixed part 35 of the machine and held in its adjusted position by lock nuts 36 and 37. Each of the key-carrying arms 28 and 30 is formed with a slot 38 through which the stem of a headed pin 39 passes. Each pin 39 is fixed to its lever arm 20 and is normally maintained seated in the lower end of its slot by a U-shaped wire expansion spring 40, anchored at one end by a screw 41 on the associated lever arm 20. The opposite free end of each spring bears against a hooklike extension 42 on the companion lever arm 28 or 30. The force of each spring 40 is exerted to normally maintain the key-carrying lever arm relatively to its arm 20 in the position shown in the drawings. The force of each of said springs is such that case-shifting movement may be transmitted from any of the shift keys 29, 31 or 32 to the shift rail and the parts supported thereby without flexing said spring until further movement of the parts down to the actuated key-carrying lever arm is arrested by the case shift stops 15. When this occurs the lost motion connection formed by the pin 39 and slot 38 of the depressed shift-key enables the lever arm 28 or 30 which carries it to continue its motion and flex the spring 40, thus preventing excessive pressure on the train of shifting connections. The independent motion of the key-carrying arm continues until it is arrested by the co-operation of the companion stops 33 and 34. At this time the parts 13 are held firmly against the screw stops 15 by the reaction of the spring 40 of the depressed shift-key.

It will be understood that if the train of connections between each shift-key and the platen was a rigid one throughout, excessive pressure exerted on a shift-key after the platen is arrested might tend to unduly strain, distort or derange the parts, and interfere with their usefulness and the assurance of accurately shifting the platen and holding it in shifted position. However, by interposing a spring as 40 between each shiftkey and the parts to be shifted, and through, which spring the parts are shifted, the above mentioned difficulties are overcome. Excess pressure exerted on a shift-key after the platen is arrested in the present construction merely causes the shift key carrying arm to move on its pivot 27 against the force of its spring 40, and excessive pressure cannot be exerted on the train of connections beyond the lever arms 28 or 30. Therefore, there is no liability of straining or injuring the train of shift connections.

In the present instance each of the pivot screws 27 is extended outwardly to form a pin 43, grooved at 44 to receive a hooked end 45 of a rod 46. Each rod 46 is connected to one end of a spring 47 anchored at its opposite end to a pin 48 projecting from a fixed part of the machine. These springs 47 tend to counteract the weight of the platen and platen frame andrender the case shifting operation comparatively light at the keys.

The shift-lock key 32 is mounted on a lever 49 of the usual construction. Said lever is pivoted at 50 to the lever arm 30, and is provided at its lower end with a hooklike engaging portion 51. ,This part 51 is adapted to engage beneath the lower edge 52 of a locking member having its footpiece 54 secured by headed clamping screws 55 and 56 to the base of the machine. The stem of the screw 55 passes through a slot 57 in the foot-piece 54 to enable said footpiece with the locking member 53 to receive an up and down adjustment. A spring 58 is effective to normally maintain the locking lever 49 in the relative position on the lever as shown, with the front edge of the locking lever bearing against a pin 59 projecting laterally from the lever arm 30. The construction and arrangement of parts are such that the hook-like engaging member of the locking lever is not brought beneath the lower edge 52 of the locking member until after the platen frame has been arrested by the stops 15. After such arrest a further depression of the shift-lock key causes the lever arm 30 to move independently of the arrested parts by reason of the lost motion connection 38-39. This independent movement of the lever arm 30 against the force of the spring 40 through pressure exerted on the depressed key 32 carries the hook 51 beneath the lower edge of the locking member 53, thus locking the parts in shifted position. The release of the locked lever 49 is effected by depressing the key 31. carrying the lever arm 30 down to the stop 34 when the hook-end of the lever 49 will be released from the looking member 53 and the spring 58 will return said lever 49 to its normal position relatively to the lever arm 30.

It will be understood that I have provided simple and efficient means for shifting the platen or case shifted parts through a long train of lever connections from a kev at either side of the machine without liability of straining, deranging or injuring such train of connections by an excessive pressure exerted on any of the shift connections.

hat T. claim as new and desire to secure by Letters Patent is: V

1. In a. typewriting machine. the combination of a part to be shifted: and a case shift mechanism therefor comprising a rock shaft, means positively connectedwith said rock shaft and co-operative with said shiftable part to shift it, and shift-keys at opposite sides of the machine connected to said rock shaft by lost-motion connections and by a spring between each shift-key and said rock shaft and through which motion is transmitted to the rock shaft from the actuated shift-key. the force of said springs being such that they are not flexed until the shiftable part has been arrested and then only by excess pressure exerted on a shift key, whereby such excess pressure cannot be positively exerted on said rock shaft and the parts controlled thereby.

2. In a typewriting machine, the com bination of a case shift frame comprising a rock shaft and side members fixedly connected to said shaft, said frame oscillating on the axial center of said shaft; shift keys at opposite sides of the machine connected to said frame by a lost motion connection; and a spring interposed between each shift key and said shift frame and through which motion is transmitted from a shift-key to said shift frame, the force of said springs being such that they are not flexed until the shift frame has been arrested and then only by excess pressure exerted on a shift key, whereby such excess pressure cannot be positively exerted on the shift frame and the parts controlled thereby.

3. In a typewriting machine, the combination of a case shift frame comprising a rock shaft and the side members fixedly connected to said shaft, said frame oscillating on the axial center of said shaft; lever arms at opposite sides of the machine each pivoted to and capable of having a limited extent of lost motion on the shift frame; a shift-key carried by each of said lever arms; and a spring interposed between each of said lever arms and a shift frame and through which motion is transmitted from' the actuated shift-key to said frame, the force of said springs being such that they are not flexed until the shift frame has been arrested and then only by excess pressure exerted on a shift key, whereby such excess pressure cannot be positively exerted on the shift frame and the parts controlled thereby.

4. In a typewriting machine, the combination of av case shift frame comprising a rock shaft and the side members fixedly connected to said shaft, said frame oscillating on the axial center of said shaft; lever arms at opposite sides of the machine, each pivoted to and capable of having a limited extent of lost motion on the shift frame; a shift-key carried by each of said lever arms; akey controlled case shift looking device carried by one of said lever arms; a coacting locking device carried by a fixed part of the machine, and springs which connect said lever arms and the case shift frame to move together, the force of said springs being such that they are not flexed until the shift frame has been arrested and then only by an excess pressure exerted on a shift key, whereby such excess pressure cannot be positively exerted on the shift frame and the parts controlled thereby.

5. Ina typewriting machine, the combination of ashift rail, a platen frame shifted thereby, adjustable means for limiting the motion of the platen frame, links near the opposite ends of the shift rail, lever arms at opposite sides of the machine and to which the links are connected, a rock shaft to which said lever arms are fixedly con nected, forwardly extending lever arms pivoted on said first mentioned lever arms for limited movement thereon, a shift key carried by each of said forwardly extending lever arms, and a spring between each of said first mentioned lever arms and its companion forwardly extending lever arm and through whlch motion 1s transmitted from the actuated shift key to. said rock shaft-and the parts controlled thereby, the force of said springs being such that they are not flexed until said rock shaft and the parts controlled thereby have been arrested and then only by excess pressure exerted on a shift key, whereby such excess pressure cannot be positively exerted on the rock shaft and the parts controlled thereby.

6. In a typewriting machine, the combination of a shiftable platen frame; case shift stops therefor; and case shifting means for said platen frame comprising a rock shaft, rearwardly extending lever arms carried by and fixedly connected to said shaft, one near each side of the machine, forwardly extending key-carrying lever arms pivoted to said first mentioned lever arms, and substantially U-shaped springs one anchored at one end thereof to one of each associated pair of lever arms and bearing at its other end against the companion lever arm, the force of each spring being such that movement is transmitted therethrough from the associated shift-key to the platen frame but excess pressure on a key after the platen frame is arrested by its stops tends to flex the companion spring and prevent such excess pressure from'being exerted on the companion rearwardly extending lever arm and the parts controlled thereby.

Signed at Ilion, in the county of Herki mer and State of New York, this 5 th day of May, A. D. 1923.

' GEORGE A. SEIB. Witnesses:

LINNIE F. BURNETT, HAROLD L. SA S, 

